This tutorial guides users on setting up an application that sends notifications to a Slack channel whenever a virtual number from Nexmo receives a text message, utilizing Node.js, Express, and ngrok for exposing the local web server to the internet. The application requires a Vonage API account, a virtual phone number, and an incoming webhook URL generated by Slack. With these components in place, users can receive notifications about inbound messages, allowing them to track their communication with users or customers effectively.